$2x\left(1+y^2\right)dx-2y\left(1+x^2\right)dy=0$
$\left(-a+d-c+d\right)^2$
$b^2+7b+12$
$x^2+y^2+3x+y+10=0$
$y^2+12y+11$
$4m^4-49n^2$
$\left(\frac{1}{6}m^2n-\frac{4}{3}mn^2\right)\left(-0666m^2n-1333mn^2\right)$
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